CVE-2017-9526 Information

Description

In Libgcrypt before 1.7.7 an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory to ensure that constant-time point operations are used in the MPI library.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

http://www.debian.org/security/2017/dsa-3880 http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html http://www.securityfocus.com/bid/99046 https://bugzilla.suse.com/show_bug.cgi?id=1042326 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=5a22de904a0a366ae79f03ff1e13a1232a89e26b https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=f9494b3f258e01b6af8bd3941ce436bcc00afc56 https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9